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#1 To Hyperthread?
Posted: Sat May 26, 2012 5:16 pm
by Janos (retired)
Simple question:
Should I turn CPU hyperthreading on or off on a dedicated cruncher?
Janos
#2
Posted: Sat May 26, 2012 7:03 pm
by PinkPenguin
Leave it on. You still get better throughput than a single CPU by itself though it is more like 1.5 CPUs.
Most BOINC programs need to transfer data and code from memory to CPU so Front Side Bus and Cache configurations are really what makes efficient use of a single CPU.
#3
Posted: Sat May 26, 2012 9:25 pm
by Janos (retired)
Thanks :)
#4 Re: To Hyperthread?
Posted: Sun Aug 26, 2018 2:51 am
by davidbam
I was about to ask a similar question. I'll leave hyperthreading on having read this.
#5 Re: To Hyperthread?
Posted: Tue Jan 01, 2019 2:41 pm
by davidbam
When I get a moment, I plan to experiment with this as I rather doubt that the improvement is as high as 50% - I am thinking maybe 20-25% but I need to try it for myself
#6 Re: To Hyperthread?
Posted: Tue Jan 01, 2019 2:55 pm
by Bryan
On most projects you will get about 30% improvement with HT on. The projects that run really tight code (PG and SRBase) you are better to turn HT off.